ul{
  padding: 0;
  margin: 0;
  list-style: none;
}
a {
  color: #1890ff;
  text-decoration: none;
  background-color: transparent;
  outline: none;
  cursor: pointer;
  transition: color .3s;
}
a:hover,a:focus{
  outline: none;
}
::-webkit-scrollbar-track-piece {
  width: 10px;
  background-color: rgba(0, 0, 0, 0.1);
}

::-webkit-scrollbar {
  width: 10px;
  height: 6px;
}

::-webkit-scrollbar-thumb {
  height: 50px;
  background: rgba(100, 100, 100, .3);
  cursor: pointer;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(100, 100, 100, .4);
  cursor: pointer
}

.content-box {
  position: absolute;
  left: 180px;
  right: 0;
  top: 50px;
  bottom: 0;
  overflow-y: hidden;
  -webkit-transition: left .3s ease-in-out;
  transition: left .3s ease-in-out;
  background: #fff;
}
.content {
  width: auto;
  padding: 10px;
  height: calc( ~"100% - 57px" );
  overflow: hidden;
}

.content-collapse {
  left: 65px;
}

.container {
  padding: 30px;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 5px;
}

.text-center {
  text-align: center
}

.top-right-btn {
  position: relative;
  flex: 1;
  text-align: right;
}


